Angles

Front

What are congruent angles?

Back

Congruent angles are angles that have the same measure.

Front

What are supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

If angle A is 30 degrees, what is the measure of its supplementary angle?

Back

The supplementary angle is 150 degrees, since 180 - 30 = 150.

Front

If angle B is 120 degrees, what is the measure of its complementary angle?

Back

The complementary angle is 60 degrees, since 90 - 120 is not applicable, as angle B is not acute.

Front

What is the sum of angles in a triangle?

Back

The sum of angles in a triangle is always 180 degrees.

Front

What is the relationship between vertical angles?

Back

Vertical angles are always congruent; they have the same measure.